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854Rh abused because the decision was "made without a rational explanation, inexplicably departed from established policies, or rested ... on other considerations that Congress could not have intended to make relevant." Wong Wing Hang v. INS, 360 F. 2d 715, 719 (CA2 1966). In that event, we would not be finding enforcement decisions unreviewable, but rather would be reviewing them on the merits, albeit with due deference, to assure that such decisions did not result from an abuse of discretion.

That is the basis upon which I would decide this case. Under § 706(A)(2) and Abbott Laboratories v. Gardner, 387 U. S. 136 (1967), agency action, including the failure to act, is reviewable to assure that it is not "arbitrary, capricious, or an abuse of discretion," unless Congress has manifested a clear and convincing intent to preclude review. Review of enforcement decisions must be suitably deferential in light of the necessary flexibility the agencies must have in this area, but at least when "enforcement" inaction allegedly deprives citizens of statutory benefits or exposes them to harms against which Congress has sought to provide protection, review must be on the merits to ensure that the agency is exercising its discretion within permissible bounds. See Berger, Administrative Arbitrariness: A Synthesis, 78 Yale L. J. 965 (1969); L. Jaffe, Judicial Control of Administrative Action 375 (1965).

The problem of agency refusal to act is one of the pressing problems of the modern administrative state, given the enormous powers, for both good and ill, that agency inaction, like agency action, holds over citizens. As Dunlop v. Bachowski, 421 U. S. 560 (1975), recognized, the problems and dangers of agency inaction are too important, too prevalent, and too multifaceted to admit of a single facile solution under which "enforcement" decisions are "presumptively unreviewable." Over time, I believe the approach announced today will come to be understood, not as mandating that courts